Echocasting Symposium + Eternal Witness + Capture of Jingzhou

3-card combo · GU

Verdict

Yes — this 3-card loop generates infinite turns by recycling Capture of Jingzhou through an Eternal Witness token every precombat main phase.

Cards required

Cheapest stack total

$5.70

Color identity

Popularity

11 decks

Format

Commander

Buy required cards on TCGplayer

Echocasting Symposium's paradigm trigger fires at the start of each extra turn's main phase, casting a copy of itself from exile and creating a token copy of Eternal Witness; that token's enter-the-battlefield trigger returns Capture of Jingzhou from the graveyard to hand. The engine is Simic, runs cleanly with extra-turn tutors like Mystical Tutor and creature tutors like Green Sun's Zenith, and locks the table out immediately once the first extra turn resolves.

How it works

Prerequisites

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Steps

Cast Capture of Jingzhou by paying its mana cost, causing you to take an extra turn after this one.
Move to your next turn. At the beginning of your precombat main phase, Echocasting Symposium's paradigm ability triggers, causing you to cast a copy of it from exile.
Resolve the copy, creating a token copy of Eternal Witness
When the Eternal Witness token enters, it triggers, returning Capture of Jingzhou from your graveyard to your hand.
Repeat.

Result

Infinite turns; Lock

Cheaper, tighter, alternate lines

Time Warp or Temporal Manipulation slot in for Capture of Jingzhou as cheaper 5-mana extra-turn spells if the casting cost is a concern — any sorcery-speed extra-turn spell that goes to the graveyard after resolution completes the loop. The combo wins the game on the spot via combat damage or any win condition already in play, but it generates no mana, so the kill condition needs to already be on board before the loop starts.

Echocasting Symposium + Eternal Witness + Capture of Jingzhou

How it works

Cheaper, tighter, alternate lines

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